单项选择题

The word "Proteus" is closest in meaning to ______.

A．flexibility
B．diversity
C．variety
D．multiplicity
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单项选择题
The main idea of this passage is ______.
A．Knowledge of a Computer
B．Importance of a Computer
C．Function of Knowledge
D．Function of Technology
单项选择题
Which one of the following is NOT true for the reason why people prefer to buy wood-burning stoves
A．The initial cost is very low.
B．The fuel costs are cheaper.
C．Wood fires are more efficient, cleaner, and safer than ever before.
D．The wood-burning stoves are more efficient than gas or oil ones.
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